Based on articles I've read on how to share your Reminders in the Reminders app in iOS5, I thought it would be useful to summarize how to do it here.

This tip requires both users to be on iOS 5 or greater, and syncing their accounts through iCloud.com.

Apple has allowed the ability to share your Reminders lists used the Reminders app on your iPhone or iPad in iOS 5+, via iCloud. I'm sure future functionality will allow this in the App, but for now you have to use iCloud.

Note: Before starting this tip, you must ensure you are syncing your Reminders using iCloud on your iDevice. Check it in your Settings.

Here's the process:

Go into the Reminders app, and create a list to hold your shared Reminders (for example, some Reminders you would like to share with your spouse, kids or secretary). Optionally, this can be done on iCloud.com.

Log into iCloud.com with the same account you are using to sync your Reminders.

Click on the calendar.

Identify the Reminders list you would like to share to the left of the calendar, and click the icon on its right (the network icon).

Type in an iTunes account name (that is also using iCloud) you would like to share your Reminders list with.

Optional: you can select View and Edit, or just View for the sharing option.

The other user will have to accept the shared Reminders list before the accounts will be linked to share the information.

This works well. I've used it to share several shopping lists with my partner so that we can both add items as we think of them. We have shared reminder lists for all the major stores we shop at, and either one of us can simply tell Siri "Add peanuts to my Safeway list" to have it show up on both of our iPhones. Each item, like individual reminders, are then put in a list that can be checked off as the items are found.

It can be enabled in iCal on Lion too, if you have enabled iCloud for calendars. Open iCal, choose "Show Reminders" from the "View" menu, if not already shown. In the right hand column click on "Reminders", right click the reminder list you wan't to share, and select "Share reminder list...".